Paint and varnish remover.



more sT Tns PATENT, OFFICE.

' cnnnnron arms, or LAncniuonr, New roux, nssIe-Non To CHADELOID CHEMICAL COMPANY, NEW YQBK, N. Y., A CORPORATION OF WEST VIRGINIA.

Specification of Letters Patent.

ratenteuiua 5, 1914.

Ho Drawing, original application filed February 26, 1907, Serial No. 359,509. Divided and this application filed August 6, 1907. SeriaI No. 387,271.

ing of paint or varnish has been removed any acid remaining on the treated surface.

may quickly evaporate and leave the same in a tit condition for the application of a new finish coating.

My invention is designed to provide an especially ellicient remover for coatings containing readily decomposable paint pigments, such as the carbonates, among which white lead is the most noteworthy example. When my remover is applied to such coating's the pigments are immediatelyattacked by the acid and rapidly disintegrated under the influence of the chemical action. In the case of carbonates this action is especially ,eflective owing to the simultaneous mechanical disintegration of the paint or varnish coating due to the evolution and escape of carbon dioxid. The evolution of gas also increases the efiiciency of the neutral volatile solvents present to a marked de ree as the-latter are subjected to a continual agitati'on thereby, resulting in submitting the surface under treatment. to all parts oi the body of solvents alike.

For the purposes of this. invention 1 prefor to use formic acid. This may be mixed with benzol or one or more substances allied thereto in their solvent properties such as the benzol homologues, including toluol,

xylol and eumene; the petroleum hydrocan bone, such. as benzi'n and lemmas"; the" chlorinated hydrocarbons, such as rtion tetrachlorid and chlorbenzol; the simple others such as methyl, ethyl and amyl properties may also be added, such as methyl, amyl and denatured alcohols; the ketones, as acetonefmethyl acetone, methyl ethyl ketone, acetone oil, butyrone and pinacolin; andlight oil of hard wood tar. I preferably add a thickener of somekind to this mixture to retard the evaporation of the solvents, although I do not consider this essential. Among such substances that are useful in this connection may be mentioned Wood fiour, starch, whiting, infusorial earth, the soaps, the waxes and nitrocellulose. These thickeners when added are incorporated during agitation sofas, to secure as homogeneous a mixture-as possible. Those thickeners which are soluble in one or more of the solvents are first incorporated in the solvents which dissolve them most readily.

My preferred composition comprises among other ingredients Amyl alcohol 15 parts. Light kerosene i 10 parts. Pinacolin 20 parts. -Formic acid i 5 parts.

Other solvents from the preceding lists might, of course, be added or substituted, such for instance as suitable proportions of one or more of the chlorinated. hydrocarbons, ethers, esters and tar oils referred to as well as several per cent. of waxy or other thickening material. In some of these mixtures reaction probably takes place between the formic acid and one or more of the other ingredients, though exactly what the reaction may be in each case is not certain. Thickening material may be added it de sired.

A composition of this character is espe cially useful in dipping, that is to say where a quantity of the remover is placed in a tank and the painted article, from which the coating is to be removed, is lowered into the body of the liquid, The remover may also, however, be used in the ordinary wayby applying a superficial coating of-it-tothe painted surface. In this case it *is desirahle, to'incorporate a thickener.

Whatl-"claim and wish to cover by Letters Patent "is:

1. The finish remover comprising approximately fifteen, parts of amyl alcohol, ten

parts of light kerosene, twenty parts of pinacolin, five parts of formic acid and incorporated thickening material.

2., The finish remover comprising approximately alcoholic solvent material, fifteen parts, light hydrocarbons ten parts, pinacolin twenty parts, formic acid five parts, and incorporated. thickening material.

3, The finish remover comprising'ep roXimately alcoholic solvent material 1 fteen parts, light oily hydrocarbons ten parts ketonic material comprising pinecolin twenty parts, formic acid five parts, and incorporated thickening material.

4:. The finish remover consisting in large proportion of alcoholic and ketonic solvent material comprising pinacolin, with which is incorporated miscible hydrocarbongfon mic acid and thickening material 5. The finish remover comprising approxinooasvo SAMUEL R. BELL, HARRY W. BROWN. 

